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Which represents the balanced double displacement reaction between sodium chloride (na+cl-) and copper sulfate (cu2+(so4)2-) ?
nacl + cu(so4) --> na2(so4) + cucl2
nacl + cu(so4) --> na(so4) + cucl
2nacl + cu(so4) --> na2(so4) + cucl2
nacl + cu(so4) --> cl(so4) + nacu
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